Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea27baa9448135b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 09:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc93fd5ca2d33c44a23029d0ddc6d411 SHA-1: 39a69ebb36bfe16ca9113e79a3df47f7707cb08f SHA-256: 1ea27baa9448135b89549cd0bc81e8012e3a85fa8773b7cd3964475602257af1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=descriptive+words+starting+with+i+for+a+person PDF link annotation
    • http://art-lan.ru/uploads/assets/file/gutagizadivikovima.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7898bd6d---95771940839.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/15406034807.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210908155614_a0bl8m.pdfIn PDF document text
    • http://isvpro.com/custom/files/72397170517.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/xejezobuxuso.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/21939680255.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/63609408997.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/ririninapize.pdfIn PDF document text
    • http://corkpotters.com/images/80589454333.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60423001141.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/72205201871.pdfIn PDF document text
    • http://schokozentrale.de/idata/74458626029.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/78319287837.pdfIn PDF document text
    • http://airmon.hu/images/files/74400578562.pdfIn PDF document text
    • http://watch62.ru/files/files/novesubimikejowux.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/63151177700.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fudaxujolirima.pdfIn PDF document text
    • http://test-immo.com/file/zarevekinofatokekupu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f885b34570fbfa2f548352802d90d0d4/xisesotutakawe.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/94372733734.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/kufiwaxovagemobesuv.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/ledobuxiriwek.pdfIn PDF document text
    • https://kawanmto.info/contents/files/5944698185.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/monet.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/51248133867.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 17824 bytes
SHA-256: 2610778a541d9b841b8c82bfce9385919129180ea393f54892ffeea6058a970a
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 11004 bytes
SHA-256: 6259653d383e409a88816944dff6b97e0fe954d1ff91df1386076a474ca00645
font_02_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1